var $form1=$("<form action='"+url+"' id='f' name='f' method='post'></form>");
$form1.append($("<input type='hidden' name='"+i+"' value='"+params[i]+"'/>"));
var scriptStr="<script type='text/javascript'>document.f.submit();</script>";
$("body").append($form1);
var newWindow=openwin("",null,800,600);
newWindow.document.write($form1[0].outerHTML+scriptStr);

var $form1=$("<form action='"+url+"' id='f' name='f' target='newWindow1' method='post'></form>");
for(var i in params){
$form1.append($("<input type='hidden' name='"+i+"' value='"+params[i]+"'/>"));
}
$("body").append($form1);
var newWindow=openwin("",'newWindow1',800,600);
$form1.submit();